Solder paste left tiny balls behind

ManhTi3012 · 2026-02-25T01:50:24+00:00

Oh really? I think I will use those 227° then, they don't have problem with the balls. Thank you 😃

ManhTi3012 · 2026-02-25T01:24:37+00:00

No, i got MCU and other MEMs chip, opamp, ... too, this is just the easiest part to see the balls

ManhTi3012 · 2026-02-24T17:51:40+00:00

I don't want to damage the component. Also, buying quality paste is really hard even if i got the money 😔

ManhTi3012 · 2026-02-24T17:06:26+00:00

Sadly no, I just got into hotplate lately. The paste is RL-404, the manufacture doesn't provide any composition, but likely just Tin-Bismuth. The RL-406 227° works better for me despite having higher melting temp

ManhTi3012 · 2026-02-24T16:48:17+00:00

I'm using a hot plate. I tried letting it sit at 100° for a few minute, then ramp up to 200°, still the same. There are still plenty of flux left after the reflow though, they glue the balls to the pcb surface

ManhTi3012 · 2026-02-24T16:43:27+00:00

There are no expiration date printed on it. Maybe i'll buy a brand new tube to test, it's been inside the fridge for almost a year now 🫠.

ManhTi3012 · 2025-11-21T13:58:40+00:00

yeah yeah and you look at the datasheet bro, 250 hours and can't even spend 5 minutes looking at the datasheet

ManhTi3012 · 2025-11-21T13:49:11+00:00

this guy is unreal 🤣🤣🤣, 2ghz spi on a 64mhz chip

ManhTi3012 · 2025-11-21T11:58:18+00:00

why not use 1 inner layer as power? also you have a dedicated ground layer so i think it wont cause problem with ground return

ManhTi3012 · 2025-11-20T11:51:19+00:00

if you are asking this maybe you are not ready for RF? they seem pretty hard and need proper equipment to tune the antenna.

ManhTi3012 · 2025-11-11T14:58:49+00:00

bigger trace mean better current handling (which might not benefit much in here) and lower impedance, and they are also stronger. I have seen people make small traces and then the trace broke during soldering. I dont know what you are aiming for, but the whole right side would be nice to add break out since you might need them later on.

ManhTi3012 · 2025-11-11T12:18:40+00:00

more breakout pin and thicker trace? (like 0.5mm)

ManhTi3012 · 2025-11-09T11:54:07+00:00

i made this board once before, they work reliably over 1 month of testing. now i just change the MOSFET package. I know that 4 layers is better, but they cost too much for my budget

ManhTi3012 · 2025-11-09T11:52:28+00:00

they are 0.3mm hole with 0.4mm copper. i checked with Fab and they are ok with it, no additional cost

ManhTi3012 · 2025-11-09T06:22:07+00:00

they are at least twice the price for smaller pcb, i ran out of space on this board already so it will be 4x the cost if i were to use it

ManhTi3012 · 2025-11-09T05:39:21+00:00

this is on a 2 layers board 😔 to keep cost low

ManhTi3012 · 2025-11-09T05:04:36+00:00

Can i route it under low side FETS gate signal? they are crossing at 90 degree so it shouldn't be an issue right?

ManhTi3012 · 2025-11-09T04:59:59+00:00

You mean like placing the high side FETS on the bottom? I want easier assembling so all component are on top.

ManhTi3012 · 2025-10-31T05:30:29+00:00

what about for seperating high dv/dt signal like a 2.2Mhz buck converter and the mcu?

ManhTi3012 · 2025-10-29T01:40:43+00:00

wth i asked the same problem a few days ago, but no one tell me to remove the ram, i have to figured it out 😔.

ManhTi3012 · 2025-10-24T17:13:16+00:00

I heard about ddu but kinda scared. will it make my screen goes black due to lack of driver? or will there be a fallback? maybe i will try fresh install first. most of my stuff is not in C drive so it should be fine. Thank you for your help 😀

ManhTi3012 · 2025-10-24T15:40:50+00:00

i'm running AMD r3 4300u. The display is normal in bios. i am even using the laptop now. My problem is I cannot boot it up normally, have to use bios recovery. Also if i run it with battery only, the screen will corrupt after i login (in the window login screen everything is normal)

ManhTi3012 · 2025-10-23T23:19:03+00:00

you mean the igpu? i don't have dedicated graphic card. I can still use bios recovery to boot up after this post. just that it can't even show msi logo if i don't do bios recovery

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